GPicView - A Simple and Fast Image Viewer for X

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FAQ:

How to set gpicview to default image viewer? Use following command line:xdg-mime default gpicview.desktop `grep 'MimeType=' /usr/share/applications/gpicview.desktop | sed -e 's/.*=//' -e 's/;/ /g'`
NOTE: xdg-utils is needed here. It's a tool released by Portland project of Freedesktop.org. Most modern Linux distros have this tool installed by default.